Eucalliaxiopsis aequimana ( Baker, 1907 )

Poore, Gary, 2021, Indo-West Pacific and Australian species of Eucalliacidae with descriptions of four new species (Crustacea: Axiidea), Memoirs of Museum Victoria 80, pp. 1-41 : 18-21

publication ID

https://doi.org/ 10.24199/j.mmv.2021.80.01

publication LSID

urn:lsid:zoobank.org:pub:EA21667A-77A5-411D-9C1A-23ECFFF3D505

persistent identifier

https://treatment.plazi.org/id/03BE8786-D33C-3548-3BDE-F95BE40BDE5A

treatment provided by

Felipe

scientific name

Eucalliaxiopsis aequimana ( Baker, 1907 )
status

 

Eucalliaxiopsis aequimana ( Baker, 1907) View in CoL

Figures 13 View Figure 13 , 14 View Figure 14 , 25a, b View Figure 25

Callianassa aequimana Baker, 1907: 182–185 , pl. 24 figs 1–8.— Hale, 1927: 87, fig. 83.— Poore and Griffin, 1979: 245, figs 12, 13.

Callianassa (Callichirus) aequimana .—De Man, 1928b:28, 93, 114.

Calliax aequimana .—de Saint Laurent and Manning, 1982: 222.— Sakai, 1988: 53, 61.— Sakai, 1999: 118–119 (not fig. 31).— Tudge et al., 2000: 145.— Davie, 2002: 459.— Sakai, 2005: 202. Eucalliax aequimanus .— Poore, 2004: 184, fig.50e, f. Calliaxina aequimana View in CoL .— Sakai, 2011: 498–499. Eucalliax aequimana .— Dworschak, 2014: 236, 244, figs 8, 9h, i. Bakercalliax aequimana .— Sakai, 2018: 738.

Material examined. Australia. NSW, Balmoral Beach , 33.8° S, 151.3° E, AM P.3636 (male, 20 mm) GoogleMaps .

Victoria. San Remo, NW from rock outcrop 1.1 km E of Back Beach Rd ( MRG transect 4), 38.53° S, 145.38° E, NMV J59759 About NMV (female, 9.6 mm). San Remo, channel bank end, 38.5233° S, 145.363° E, NMV J59762 About NMV (female, 6.6 mm). Port Phillip Bay, Geelong arm, 3 m, ( NMV stn PPBES 953 ), 38.155° S, 144.545° E, NMV J16782 About NMV (4 females, 3.4–4.7 mm) GoogleMaps .

Tasmania. Waterhouse Island, 3–5 m, 40° 48' S, 147° 38.7' E (Moverley stn 52), NMV J71685 About NMV (juv., 2.9 mm). Georges Bay , Steiglitz Beach, 3–4 m, 41° 19.3' S, 148° 19.1' E (Moverley stn 42) NMV J71686 About NMV (juv., 2.9 mm) GoogleMaps .

South Australia. Port MacDonnell, 38.05° S, 140.7° E, NMV J16783 About NMV (male, 12.8 mm). Dutton Bay , eastern shore, 34.0489° S, 136.415° E, NMV J71688 About NMV (male, 12.2 mm; 3 females, 8.9–11.9 MM), NMV J59651 About NMV * (female, 11.2 mm). NMV J71687 About NMV (male, 11.0 mm) GoogleMaps .

Western Australia. Houtmans Abrolhos, WAM C9113 About WAM (male, 14.8 mm). Dalkeith, Swan River , WAM C1410 About WAM (male, 16.2 mm). Colpoy Point , Garden Island , 32° 12' S, 115° 40'E, WAM C11975 About WAM (female, 14.4 mm). Rockingham, Point Peron, Cockburn Sound, 32° 11' S, 115° 43'E, WAM C11973 About WAM (male, 12.9 mm). Fremantle Harbour, 32° 03' S, 115° 44' E, WAM C12030 About WAM (male, 20.3 mm). Mandurah, 32° 32' S, 115° 43' E, WAM C11978 About WAM (female, 15.8 mm). Bunbury, 33° 20' S, 115° 38'E, WAM C11990 About WAM (female, 10.1 mm). Harbour Board, Bunbury, WAM C5056 About WAM (female, 21.3 mm). Koombana Beach, Bunbury, 33° 20' S, 115° 38' E, WAM C12029 About WAM (male, 14.9 mm). Leschenault Estuary, Bunbury, 33° 20' S, 115° 38' E, WAM C11986 About WAM (male, 11.2 mm). Peel Inlet, 32° 36' S, 115° 43' E, WAM C11968 About WAM (male, 8.9 mm; female, 17.6 mm). Albany, 32° 00' S, 117° 52'E, WAM C11994 About WAM (female, 13.0 mm). Albany, WAM C6792 About WAM (female, 15.9 mm). Cheyne Beach, WAM C11987 About WAM (female, 19.8 mm). King George Sound, MNHN Th578 (female) GoogleMaps .

Diagnosis. Pleonite 1 with pleopods attached to pair of sternal plates. Eyestalk about twice as long as wide. Antennule peduncle reaching to base of antenna peduncle article 5. Maxilliped 3 exopod absent. Cheliped carpi distolateral margin square at lower angle, propodi lateral face with oblique longitudinal ridge extending from beyond mid-length of palm on to base of finger, upper mesial face with row of clusters of long setae. Male pleopod 1 article 1 without distal setae, article 2 parallel-sided, apically rounded, with marginal setae, without appendix interna. Female pleopod 2, appendix interna present. Uropod endopod ovate. Telson without transverse row of spiniform setae.

Description of male. Carapace smooth, with pair of shallow longitudinal groove posterior to rostrum; gastric–abdominal regions together 4.3 times as long as wide; branchiostegite calcified, with tessellated pattern of sulci; cervical groove at 0.6 carapace length, scarcely obvious on branchiostegite; cardiac sulcus at 0.76 carapace length, not meeting mid-dorsally, extending transversely across half of branchiostegite, with complex branches dorsally.

Rostrum blunt or obsolete. Anterolateral carapace lobe longer than rostrum, with rounded apex, anteriorly directed, with numerous submarginal dorsal setae.

Thoracic sternite 7 1.15 times as long as wide, with well-defined median sulcus over posterior half, lateral groove anterior to coxal articulation poorly defined, oblique, not meeting medially, with 3 posterolateral clusters of long setae. Pleonal sternite 1with pair of swollen well marked areas anterior to ridge bearing pleopods; without setae. Pleonite 6 lateral margin smooth.

Eyestalks 1.6 times as long as wide at base, tapering around cornea, acute apical tubercle sometimes present; cornea subcircular. Antennular peduncle 2.5 times as long as width of both eyestalks; article 2 2.5 times as long as wide; article 3 0.6 times as long as article 2; articles 2 and 3 with ventrolateral row of long setae, continued onto flagellum. Antennal peduncle 3 times as long as width of both eyestalks, overreaching antennule peduncle by third of article 5; scaphocerite wider than long, subcircular; article 4 c. 5 times as long as wide; article 5 0.6 length of article 4. Maxilliped 3 ischium with slightly convex mesial margin, expanding from narrow proximomesial corner; ischium–merus upper margin 1.5 times as long as greatest width; crista dentata of c. 25 small teeth; carpus–dactylus together almost as long as ischium–merus.

Chelipeds subequal, propodus of major cheliped about 1.2 times that of minor, of similar widths, major dactylus stouter than that of minor. Major cheliped ischium twice as long as distal width, lower margin with short distal tooth; merus 1.8 times as long as broad, lower margin barely convex, unarmed; carpus 1.4 times as wide as upper length, upper margin carinate, distomesial and distolateral margins simple; propodus greatest width proximally, upper palm length 1.1 width, distomesial margin of palm with 2 submarginal groups each of c. 10 setae plus small submarginal bicuspid tooth, distolateral margin of palm with submarginal group of c. 10 setae between fingers plus small submarginal tooth; fixed finger half as long as upper margin of palm, cutting edge with microdenticles over proximal half, obsolete tooth at midpoint, with obsolete lateral ridge extending on to palm; dactylus overreaching fixed finger, 2.2 times as long as width at base, cutting edge sinuous; submarginal tufts of long setae on upper and lower mesial margins of carpus and propodus, opposing mesial margins of fingers.

Minor cheliped ischium twice as long as distal width, lower margin with distal tooth; merus twice as long as broad, lower margin barely convex, unarmed; carpus 1.2 times as wide as upper length, upper margin carinate, distomesial and distolateral margins simple; propodus palm as wide as upper palm length, upper margin carinate, with blunt distal tooth, distomesial margin of palm with 2 submarginal groups of c. 10 and c. 12 setae, distolateral margin of palm with 2 submarginal groups of c. 8 and 10 setae; fixed finger half as long as upper margin of palm, cutting edge smooth, lateral concavity at base of fixed finger sharply defined by ridge on distal palm; dactylus barely overreaching fixed finger, 3.8 times as long as wide at base, cutting edge sinuous; submarginal tufts of long setae on upper and lower mesial margins of carpus and propodus, opposing mesial margins of fingers.

Pereopod 2 merus twice as long as maximum width; dactylus 3 times as long as upper margin of propodus. Pereopod 3 merus twice as long as maximum width; carpus 1.6 times as long as wide; propodus with lower margin concave, 1.6 times as long overall as mid-length; dactylus half axial length of propodus. Pereopod 4 merus length 2.7 times maximum width; carpus 2.7 times as long as wide; propodus 1.5 times as long as wide, typically setose, with 1 long distal seta overlapping dactylus.

Pleopod 1 article 1 without distal setae; article 2 parallel-sided, apically rounded, 1.8 times as long as article 1, 4 times as long as wide, apex with c. 10 marginal setae, without appendix interna. Pleopod 2 endopod 2.4 times as long as wide; appendix masculina overreaching endopod by about fifth its length, setose along posterior face and distally; lobe-like appendix interna near midpoint of appendix masculina. Pleopod 3 with appendix interna submerged in endopod margin.

Uropodal endopod anterior margin convex, posterior margin almost straight, widest about third way along, 1.7 times as long as wide, apex broadly rounded, with 2 groups of long setae at ends of anterior and posterior margins; exopod ovate, all margins continuous, greatest dimension 1.3 times greatest width, with row of blade-like distal setae on distal margin; dorsal plate extending beyond half of exopod width, distal margin with spiniform setae. Telson 1.5 times as wide as long, broadest at midpoint, posterolateral corner rounded; posterior margin deeply excavate, with posterolateral cluster of long setae plus short spiniform seta; dorsal surface with sharp transverse ridge at anterior third, notched and with few long setae at midpoint.

Female. Essentially as male except: pleonal sternite 1 with pair of oval plates supporting pleopods, each with longitudinal row of 6–8 single setae emerging from pore. Pleopod 1 peduncle curved, with dense group of plumose setae; article 2 twice as long as article 1.

Distribution. Australia, NSW (as far north as 33° S), Tas., Vic., SA, WA (as far north as 25° S). Intertidal to subtidal sediments.

Remarks. Eucalliaxiopsis aequimana is recognised by the subequal chelipeds that are not sexually dimorphic. In a sample of 14 large specimens, the ratio between the upper propodus margins of major and minor chelipeds ranged from 1.1 to 1.3, with insignificant difference between males and females. The species is notable for the simple setose article 2 of the male pleopod 1, longer than article 1, lacking an appendix interna and acute apex.

The collection from Western Australia includes specimens with carapace lengths ranging 8.9–20.3 mm, most are larger than any from South Australia or Victoria, maximum cl. 12.8 mm. They differ most obviously in the near absence of a prominent rostrum (fig. 13j).

Sakai’s (2005) synonymy includes references to other species from places outside southern Australia.

AM

Australian Museum

NMV

Museum Victoria

MM

University of Montpellier

WAM

Western Australian Museum

MNHN

Museum National d'Histoire Naturelle

SA

Museum national d'Histoire Naturelle, Laboratiore de Paleontologie

Kingdom

Animalia

Phylum

Arthropoda

Class

Malacostraca

Order

Decapoda

Family

Eucalliacidae

Genus

Eucalliaxiopsis

Loc

Eucalliaxiopsis aequimana ( Baker, 1907 )

Poore, Gary 2021
2021
Loc

Calliax aequimana

Sakai, K. 2018: 738
Dworschak, P. C. 2014: 236
Sakai, K. 2011: 498
Sakai, K. 2005: 202
Poore, G. C. B. 2004: 184
Davie, P. J. F. 2002: 459
Tudge, C. C. & Poore, G. C. B. & Lemaitre, R. 2000: 145
Sakai, K. 1999: 118
Sakai, K. 1988: 53
Saint Laurent, M. de & Manning, R. B. 1982: 222
1982
Loc

Callianassa (Callichirus) aequimana

Man, J. G. de 1928: 28
1928
Loc

Callianassa aequimana

Poore, G. C. B. & Griffin, D. J. G. 1979: 245
Hale, H. M. 1927: 87
Baker, W. H. 1907: 185
1907
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