Travisia tribus, Avery & Vodopyanov & Wilson, 2023

Avery, Lynda, Vodopyanov, Stephan & Wilson, Robin S., 2023, New species of Travisia Johnston, 1840 (Annelida, Travisiidae Hartmann-Schröder, 1971) from south-eastern Australia, Memoirs of Museum Victoria (Mem. Mus. Vic.) 82, pp. 133-142 : 136-139

Travisia tribus sp. nov.

https://zoobank.org/urn:lsid:zoobank.org:act:5CC5BBDC-CF22-

4D80-9ED3-ED16F1DDC17B

Figures 1–7

Material examined. Holotype: Australia. Victoria: Bass Strait, 1 km off Delray Beach, Stn MSL-LV 6 T8 , 38º 14' S 147º 22' E, 29 Aug 1990, 15.4 m, NMV F64973 .

Paratypes: Australia. Bass Strait , 1 km off Delray Beach, Stn MSL-LV 5 D8, 38º 14' S 147º 22' E, 29 Aug 1990, 16.5 m, 1, NMV F64952 ; Bass Strait , 1 km off Delray Beach, Stn MSL-LV 6 T3 , 38º 14' S 147º 22' E, 29 Aug 1990, 14.8 m, 1, NMV F64961 ; Bass Strait , 1 km off Delray Beach, Stn MSL-LV 1 T6 , 38º 14' S 147º 22' E, 1 Mat 1989, 15 m, 1, NMV F64967 ; Bass Strait , 1 km off Woodside Beach, Stn MSL-LV 5 W5, 38º 33' S 146º 57' E, 25 Aug 1990, 14.5 m, 1, NMV F64920 ; Bass Strait , 1 km off Delray Beach, Stn MSL-LV 1 T2 , 38º 14' S 147º 22' E, 1 Mar 1989, 16.5 m, 1, AM W54586 .

Non-type material: Australia. Victoria: Bass Strait, 1 km off Delray Beach, Stn MSL-LV 5 D8, 38º 14' S, 147º 22' E, Jan 1990, 16.5 m, 3, NMV F271084-271086 ; Bass Strait, 1 km off Delray Beach, Stn MSL-LV 1 D1, 38º 14' S, 147º 22' E, 24 Jan 1989, 16.1 m, 1, NMV F64930 ; Bass Strait, 1 km off Delray Beach, Stn MSL-LV 1 D4, 38º 14' S, 147º 22'E, Jan 1989, 16 m, 1, NMV F64940 ; Bass Strait, 1 km off Delray Beach, Stn MSL-LV 1 D6, 38º 14' S, 147º 22' E, Jan 1989, 15.8 m, 1, NMV F64946 ; Bass Strait, 1 km off Delray Beach, Stn MSL-LV 1 T8 , 38º 14' S, 147º 22' E, Jan 1989, 15.4 m, 1, NMV F64971 ; Bass Strait, 1 km off Delray Beach, Stn MSL-LV 2 D3, 38º 14' S, 147º 22' E, Jan 1989, 16 m, 1, NMV F64935 ; Bass Strait, 1 km off Delray Beach, Stn MSL-LV 2 T7 , 38º 14' S, 147º 22' E, Jan 1989, 14.8 m, 4, NMV F64968 ; Bass Strait, 1 km off Delray Beach, Stn MSL-LV 3 D2, 38º 14'S, 147º 22' E, Jan 1989, 16 m, 1, NMV F64931 ; Bass Strait, 1 km off Delray Beach, Stn MSL-LV 3 D3, 38º 14' S, 147º 22' E, Jan 1989, 16 m, 2, NMV F64936 ; Bass Strait, 1 km off Delray Beach, Stn MSL-LV 3 D4, 38º 14' S, 147º 22' E, Jan 1989, 16 m, 1, NMV F64941 ; Bass Strait, 1 km off Delray Beach, Stn MSL-LV 3 D5, 38º 14' S, 147º 22' E, 17 Jan 1989, 16 m, 6, NMV F64944 ; Bass Strait, 1 km off Delray Beach, Stn MSL-LV 3 D6, 38º 14' S, 147º 22' E, Jan 1989, 15.8 m, 1, NMV F64947 ; Bass Strait, 1 km off Delray Beach, Stn MSL-LV 3 D8, 38º 14' S, 147º 22' E, Jan 1989, 16.5 m, 2, NMV F64951 ; Bass Strait, 1 km off Delray Beach, Stn MSL-LV 3 T1 , 38º 14' S, 147º 22' E, Jan 1989, 16.6 m, 4, NMV F64954 ; Bass Strait, 1 km off Delray Beach, Stn MSL-LV 3 T3 , 38º 14' S, 147º 22' E, 24 Jan 1989, 14.8 m, 1, NMV F64958 ; Bass Strait, 1 km off Delray Beach, Stn MSL-LV 3 T4 , 38º 14' S, 147º 22' E, Jan 1989, 14.8 m, 1, NMV F64962 ; Bass Strait, 1 km off Delray Beach, Stn MSL-LV 3 T5 , 38º 14' S, 147º 22' E, Jan 1989, 15 m, 1, NMV F64964 ; Bass Strait, 1 km off Delray Beach, Stn MSL-LV 4 D2, 38º 14' S, 147º 22' E, 17 Jan 1989, 16 m, 2, NMV F64932 ; Bass Strait, 1 km off Delray Beach, Stn MSL-LV 4 D3, 38º 14' S, 147º 22' E, 17 Jan 1989, 16 m, 9, NMV F64937 ; Bass Strait, 1 km off Delray Beach, Stn MSL-LV 4 D4, 38º 14' S, 147º 22' E, Jan 1989, 16 m, 1, NMV F64942 ; Bass Strait, 1 km off Delray Beach, Stn MSL-LV 4 D5, 38º 14' S, 147º 22' E, 17 Jan 1989, 16 m, 11, NMV F64945 ; Bass Strait, 1 km off Delray Beach, Stn MSL-LV 4 D6, 38º 14' S, 147º 22' E, 17 Jan 1989, 15.8 m, 1, NMV F64948 ; Bass Strait, 1 km off Delray Beach, Stn MSL-LV 4 D7, 38º 14' S, 147º 22' E, 11 Jan 1989, 15.5 m, 1, NMV F64949 ; Bass Strait, 1 km off Delray Beach, Stn MSL-LV 4 T1 , 38º 14' S, 147º 22' E, 24 Jan 1989, 16.6 m, 8, NMV F64955 ; Bass Strait, 1 km off Delray Beach, Stn MSL-LV 4 T2 , 38º 14' S, 147º 22' E, 24 Jan 1989, 16.5 m, 1, NMV F64957 ; Bass Strait, 1 km off Delray Beach, Stn MSL-LV 4 T3 , 38º 14' S, 147º 22' E, Jan 1989, 14.8 m, 1, NMV F64959 ; Bass Strait, 1 km off Delray Beach, Stn MSL-LV 4 T4 , 38º 14' S, 147º 22' E, Jan 1989, 14.8 m, 2, NMV F64963 ; Bass Strait, 1 km off Delray Beach, Stn MSL-LV 4 T5 , 38º 14' S, 147º 22' E, Jan 1989, 15 m, 2, NMV F64965 ; Bass Strait, 1 km off Delray Beach, Stn MSL-LV 4 T7 , 38º 14' S, 147º 22' E, Jan 1989, 14.8 m, 1, NMV F64969 ; Bass Strait, 1 km off Delray Beach, Stn MSL-LV 4 T8 , 38º 14' S, 147º 22' E, Jan 1989, 15.4 m, 2, NMV F64972 ; Bass Strait, 1 km off Delray Beach, Stn MSL-LV 5 D2, 38º 14' S, 147º 22' E, 29 Jan 1990, 16 m, 1, NMV F64933 ; Bass Strait, 1 km off Delray Beach, Stn MSL-LV 5 D3, 38º 14' S, 147º 22' E, Jan 1990, 16 m, 1, NMV F64938 ; Bass Strait, 1 km off Delray Beach, Stn MSL-LV 5 D7, 38º 14' S, 147º 22' E, Jan 1990, 15.5 m, 3, NMV F64950 ; Bass Strait, 1 km off Delray Beach, Stn MSL-LV 5 T3 , 38º 14' S, 147º 22' E, Jan 1990, 14.8 m, 3, NMV F64960 ; Bass Strait, 1 km off Delray Beach, Stn MSL-LV 6 D2, 38º 14' S, 147º 22' E, 29 Jan 1990, 16 m, 1, NMV F64934 ; Bass Strait, 1 km off Delray Beach, Stn MSL-LV 6 D3, 38º 14' S, 147º 22' E, 29 Jan 1990, 16 m, 1, NMV F64939 ; Bass Strait, 1 km off Delray Beach, Stn MSL-LV 6 D4, 38º 14' S, 147º 22' E, Jan 1990, 16 m, 1, NMV F64943 ; Bass Strait, 1 km off Delray Beach, Stn MSL-LV 6 D8, 38º 14' S, 147º 22' E, 29 Jan 1990, 16.5 m, 3, NMV F64953 ; Bass Strait, 1 km off Delray Beach, Stn MSL-LV 6 T5 , 38º 14' S, 147º 22' E, Jan 1990, 15 m, 1, NMV F64966 ; Bass Strait, 1 km off Delray Beach, Stn MSL-LV 6 T7 , 38º 14' S, 147º 22' E, Jan 1990, 14.8 m, 1, NMV F64970 ; Bass Strait, 1 km off Woodside Beach, Stn MSL-LV 2 W7, 38º 33'S, 146º 57' E, Jan 1989, 15.1 m, 2, NMV F64923 ; Bass Strait, 1 km off Woodside Beach, Stn MSL-LV 3 W1, 38º 33' S, 146º 57' E, Jan 1989, 15.1 m, 2, NMV F64910 ; Bass Strait, 1 km off Woodside Beach, Stn MSL-LV 3 W2, 38º 33'S, 146º 57' E, Jan 1989, 15 m, 2, NMV F64913 ; Bass Strait, 1 km off Woodside Beach, Stn MSL-LV 3 W3, 38º 33' S, 146º 57' E, Jan 1989, 14.3 m, 2, NMV F64916 ; Bass Strait, 1 km off Woodside Beach, Stn MSL-LV 3 W4, 38º 33'S, 146º 57' E, Jan 1989, 15 m, 3, NMV F64918 ; Bass Strait, 1 km off Woodside Beach, Stn MSL-LV 3 W7, 38º 33'S, 146º 57' E, Jan 1989, 15.1 m, 7, NMV F64924 ; Bass Strait, 1 km off Woodside Beach, Stn MSL-LV 4 W3, 38º 33' S, 146º 57' E, Jan 1989, 14.3 m, 2, NMV F64917 ; Bass Strait, 1 km off Woodside Beach, Stn MSL-LV 4 W7, 38º 33' S, 146º 57' E, Jan 1989, 15.1 m, 4, NMV F64925 ; Bass Strait, 1 km off Woodside Beach, Stn MSL-LV 4 W8, 38º 33' S, 146º 57'E, Jan 1989, 15 m, 1, NMV F64927 ; Bass Strait, 1 km off Woodside Beach, Stn MSL-LV 5 W1, 38º 33' S, 146º 57' E, Jan 1990, 15.1 m, 3, NMV F64911 ; Bass Strait, 1 km off Woodside Beach, Stn MSL-LV 5 W2, 38º 33' S, 146º 57'E, Jan 1990, 15 m, 1, NMV F64914 ; Bass Strait, 1 km off Woodside Beach, Stn MSL-LV 5 W4, 38º 33' S, 146º 57'E, Jan 1990, 15 m, 1, NMV F64919 ; Bass Strait, 1 km off Woodside Beach, Stn MSL-LV 5 W6, 38º 33'S, 146º 57'E, Jan 1990, 15.5 m, 4, NMV F64921 ; Bass Strait, 1 km off Woodside Beach, Stn MSL-LV 5 W7, 38º 33' S, 146º 57' E, Jan 1990, 15.1 m, 1, NMV F64926 ; Bass Strait, 1 km off Woodside Beach, Stn MSL-LV 5 W8, 38º 33' S, 146º 57'E, Jan 1990, 15 m, 4, NMV F64928 ; Bass Strait, 1 km off Woodside Beach, Stn MSL-LV 6 W1, 38º 33' S, 146º 57' E, Jan 1990, 15.1 m, 7, NMV F64912 ; Bass Strait, 1 km off Woodside Beach, Stn MSL-LV 6 W2, 38º 33' S, 146º 57'E, Jan 1990, 15 m, 1, NMV F64915 ; Bass Strait, 1 km off Woodside Beach, Stn MSL-LV 6 W6, 38º 33' S, 146º 57' E, Jan 1990, 15.5 m, 1, NMV F64922 ; Bass Strait, 1 km off Woodside Beach, Stn MSL-LV 6 W8, 38º 33' S, 146º 57' E, Jan 1990, 15 m, 1, NMV F64929 ; Bass Strait, near Seaspray, 1 km off The Honeysuckles , Stn MSL-LV 1 S2, 38º 22' S, 147º 12' E, 9 Jan 1989, 16 m, 2, NMV F64892 ; Bass Strait, near Seaspray, 1 km off The Honeysuckles , Stn MSL-LV 2 S1, 38º 22' S, 147º12' E, 9 Jan 1989, 15.5 m, 1, NMV F64889 ; Bass Strait, near Seaspray, 1 km off The Honeysuckles , Stn MSL-LV 2 S2, 38º 22' S, 147º 12' E, 9 Jan 1989, 16 m, 1, NMV F64893 ; Bass Strait, near Seaspray, 1 km off The Honeysuckles , Stn MSL-LV 2 S3, 38º 22' S, 147º 12' E, Jan 1989, 16 m, 1, NMV F64895 ; Bass Strait, near Seaspray, 1 km off The Honeysuckles , Stn MSL-LV 2 S6, 38º 22' S, 147º 12' E, 9 Jan 1989, 16 m, 1, NMV F64902 ; Bass Strait, near Seaspray, 1 km off The Honeysuckles , Stn MSL-LV 2 S7, 38º 22' S, 147º 12' E, Jan 1989, 16 m, 2, NMV F64905 ; Bass Strait, near Seaspray, 1 km off The Honeysuckles , Stn MSL-LV 3 S1, 38º 22' S, 147º 12' E, 23 Jan 1989, 15.5 m, 1, NMV F64890 ; Bass Strait, near Seaspray, 1 km off The Honeysuckles , Stn MSL-LV 3 S2, 38º 22' S, 147º 12' E, Jan 1989, 16 m, 1, NMV F64894 ; Bass Strait, near Seaspray, 1 km off The Honeysuckles , Stn MSL-LV 3 S3, 38º 22' S, 147º 12' E, Jan 1989, 16 m, 1, NMV F64896 ; Bass Strait, near Seaspray, 1 km off The Honeysuckles , Stn MSL-LV 3 S4, 38º 22' S, 147º 12' E, Jan 1989, 14.5 m, 2, NMV F64897 ; Bass Strait, near Seaspray, 1 km off The Honeysuckles , Stn MSL-LV 3 S5, 38º 22' S, 147º 12' E, Jan 1989, 15.5 m, 1, NMV F64899 ; Bass Strait, near Seaspray, 1 km off The Honeysuckles , Stn MSL-LV 3 S8, 38º 22' S, 147º 12' E, Jan 1989, 15.3 m, 1, NMV F64908 ; Bass Strait, near Seaspray, 1 km off The Honeysuckles , Stn MSL-LV 4 S1, 38º 22' S, 147º 12' E, 23 Jan 1989, 15.5 m, 3, NMV F64891 ; Bass Strait, near Seaspray, 1 km off The Honeysuckles , Stn MSL-LV 4 S4, 38º 22' S, 147º 12' E, Jan 1989, 14.5 m, 1, NMV F64898 ; Bass Strait, near Seaspray, 1 km off The Honeysuckles , Stn MSL-LV 4 S5, 38º 22' S, 147º 12' E, 23 Jan 1989, 15.5 m, 1, NMV F64900 ; Bass Strait, near Seaspray, 1 km off The Honeysuckles , Stn MSL-LV 4 S7, 38º 22' S, 147º 12' E, Jan 1989, 16 m, 1, NMV F64906 ; Bass Strait, near Seaspray, 1 km off The Honeysuckles , Stn MSL-LV 5 S5, 38º 22' S, 147º 12' E, 28 Jan 1990, 15.5 m, 1, NMV F64901 ; Bass Strait, near Seaspray, 1 km off The Honeysuckles , Stn MSL-LV 5 S6, 38º 22' S, 147º 12' E, 28 Jan 1990, 16 m, 1, NMV F64903 ; Bass Strait, near Seaspray, 1 km off The Honeysuckles , Stn MSL-LV 5 S7, 38º 22' S, 147º 12' E, 28 Jan 1990, 16 m, 2, NMV F64907 ; Bass Strait, near Seaspray, 1 km off The Honeysuckles , Stn MSL-LV 5 S8, 38º 22' S, 147º 12' E, 28 Jan 1990, 15.3 m, 3, NMV F64909 ; Bass Strait, near Seaspray, 1 km off The Honeysuckles , Stn MSL-LV 6 S6, 38º 22' S, 147º 12' E, 28 Jan 1990, 16 m, 1, NMV F64904 .

South Australia: Great Australian Bight, Stn SS 2013_RC07 13, 33º 20.316' S, 130º 15.72' E, 13 Jan 2013, 200 m, 1, SAM ; Great Australian Bight, SZ 12, Stn IN 2017_C01 216, 35º 40.504' S, 135º 38.964' E, 25 Jan 2017, 141 m, 2, NMV F2425602 .

Tasmania: off Bicheno , 41º 50.23' S, 148º 16.52' E, Apr 2020, 50 m, 1, NMV F305298 .

Diagnosis. Body comprising 26–54 chaetigers, mouth located between chaetigers 1 and 2; branchiae present on 37–38 chaetigers; chaetiger 1 biannulate; chaetiger 2 triannulate; 6–8 posterior abranchiate segments.

Description. Body comprising 26–62 segments; 26–59 chaetigers; 0–3 achaetous posterior segments; 9–90 mm long, 2–5 mm wide (holotype 21 mm long, 4 mm wide, 45 chaetigers plus three posterior achaetigerous segments). Fusiform, yellowish in alcohol [figs 1, 2]). Prostomium length about equal to maximum width; a pointed cone, often retracted or distorted in preservation. Mid-ventral groove absent (fig. 3). Mouth located between chaetigers 1 and 2. Chaetiger 1 biannulate, subsequent chaetigers until chaetigers 25–28 triannulate, transition to biannulate posterior chaetigers occurs incompletely over chaetigers 25–28 (24–25 in the holotype) (figs 1–4). Segments minutely papillate with raised ridge of slightly larger papillae on posterior-most part of each annulus. Branchiae present from chaetiger 2, 37–54 pairs (39 in the holotype), 6–9 posterior abranchiate segments (nine in the holotype), branchiae initially short, becoming longer by chaetiger 8 but always much shorter than body diameter, most smooth several branchiae minutely annulate on mid-body chaetigers. Neuropodial and notopodial lappets present from chaetiger 1, initially minute flattened lobes, becoming progressively larger triangular finely papillate lappets from chaetiger 14–16 (15 in the holotype), neuropodial lobes commence chaetiger 12–14 (14 in the holotype) developed into prominent lappets enclosing deep lateral grooves over 10–15 posterior-most segments (12 in the holotype). Interramal pores first present chaetiger 1; last present chaetiger 26–40. Nephridiopores first present chaetiger 3 (but not visible on many specimens). Capillary chaetae smooth. Anal tube equal to length of two posterior segments. Pygidial lobes 5–7 (five in the holotype). Two or three internal pygidial cirri (two in the holotype) (fig. 5).

Epidermal papillae comprising irregular, barely raised polygons, each with 15–25 pores. Papillae width (~30 µm) about two times length (~15 µm) (width measured in circumferential direction around the worm, dimension y in fig. 7, length along the worm, dimension x in fig. 7). Prostomium mid-section darkly stained with methylene blue, tip and basal region unstained (fig. 6). Remainder of body uniformly stained, fading to only posterior-most annulation stained.

Etymology. The species name of T. tribus sp. nov. is taken from the Latin word for three, reflecting the division of the anterior segments of the new species, which comprise three annuli.

Remarks. Ten species and subspecies of Travisia have chaetiger 1 biannulate, chaetiger 2 triannulate and mouth in the usual position between chaetigers 1 and 2: T. amoyanus Yang, Wu, Wang, Zhao, Hwang and Cai, 2022 ; T. araciae Rizzo and Salazar Vallejo, 2020 ; T.brevis Moore, 1923 ; T. carnea Verrill, 1873 ; T. forbesii intermedia Annenkova, 1937 ; T. japonica Fujiwara, 1933 ; T. monroi Maciolek and Blake, 2006 ; T. nigrocincta Ehlers, 1913 ; T. olens Ehlers, 1897 . In all of these the transition to posterior annulation pattern occurs before chaetiger 21, excepting T. tribus sp. nov. (transition to biannulate pattern on chaetigers 25–28) and T. japonica Fujiwara, 1933 (transition occurring chaetigers 20–29). Travisia tribus sp. nov. can be distinguished from T. japonica by having deep lateral grooves on pre-pygidial segments and in lacking crenellations and papillae on posterior-most segments ( T. japonica has crenellations on posterior-most segments and a ring of papillae encircling the last segment).

Distribution, habitat. Known from 89 locations in southeastern Australia from the Great Australian Bight in the west, to eastern Australia at ~31– 42º S. Depth range 14– 200 m.