Leitoscoloplos phyllobranchus, Blake, James A., 2017

Blake, James A., 2017, Polychaeta Orbiniidae from Antarctica, the Southern Ocean, the Abyssal Pacific Ocean, and off South America, Zootaxa 4218 (1), pp. 1-145 : 35

publication ID

https://doi.org/ 10.5281/zenodo.245827

publication LSID

lsid:zoobank.org:pub:9345C596-8656-4B5C-AD8C-2FACF4E9240C

DOI

https://doi.org/10.5281/zenodo.4901761

persistent identifier

https://treatment.plazi.org/id/8F2387DD-0637-092F-FF31-FC22FD4DF82E

treatment provided by

GgServerImporter

scientific name

Leitoscoloplos phyllobranchus
status

sp. nov.

Leitoscoloplos phyllobranchus View in CoL new species

Figure 16 View FIGURE 16

Haploscoloplos minutus: Hartman 1978: 156 View in CoL (in part, Glacier Sta. 68-Palmer II). Not Hartman 1953.

Material examined. Antarctic Peninsula, Anvers Island, Arthur Harbor, Hero Inlet, Glacier Sta. 68- Palmer II, 17 Mar 1968, 64.77°S, 64.07°W, 40 m, holotype ( USNM 61943 About USNM ). GoogleMaps

Description. Holotype complete, broken into three parts, totaling 20 mm long and 1.2 mm wide for 56 setigerous segments. Color in alcohol: light tan. Thoracic region slightly flattened dorsoventrally; abdominal region cylindrical; middle abdominal segments moniliform.

Prostomium reduced, short, triangular, wider than long, weakly pointed anteriorly, smoothly rounded on anterior margin, recessed into large peristomial segment; nuchal organs not observed; no eyespots ( Fig.16 View FIGURE 16 A). Peristomium superficially divided into one large and one small achaetous ring; distinct from setiger 1.

Thorax with eight setigers, all similar. Notopodia with thin, cirriform postsetal lobes throughout body ( Fig.16 View FIGURE 16 C–D); thoracic neuropodia simple, with elliptical postsetal lobes ( Fig.16 View FIGURE 16 C); neuropodia of middle and posterior segments dorsoventrally swollen, forming weakly developed ventral flange, surmounted by short, triangular postsetal lobe ( Fig.16 View FIGURE 16 E).

All thoracic setae arranged in irregular fascicles of 25–30 crenulated capillaries ( Fig.16 View FIGURE 16 C). Abdominal neurosetae including 2–3 simple, non-crenulated capillaries and 2–3 imbedded aciculae. Abdominal notosetae including 3–5 long, crenulated capillaries and 1–2 furcate setae; furcate setae with three thin needles connected to blunted subequal tynes by a thin membrane ( Fig.16 View FIGURE 16 F).

Branchiae from setiger 17; small, stubby at first ( Fig.16 View FIGURE 16 D), increasing in size over subsequent setigers, becoming greatly enlarged; middle and posterior setigers with enlarged, flattened, membranous branchiae with thick inner and outer gland-like supportive structures and thin membranous blade with venation ( Fig.16 View FIGURE 16 E).

Pygidium with two lobes lacking cirri ( Fig.16 View FIGURE 16 B).

Etymology. The epithet, phyllobranchus , is derived from the Greek phyllon for leaf; branchos for gill. The name is suggested by the thin membranous appearance of the branchiae.

Remarks. Leitoscoloplos phyllobranchus n. sp. is a unique species in the form of the thin, membranous branchiae that start from setiger 17.

Distribution. Antarctic Peninsula, 40 m.

USNM

Smithsonian Institution, National Museum of Natural History

Kingdom

Animalia

Phylum

Annelida

Class

Polychaeta

Family

Orbiniidae

Genus

Leitoscoloplos

Loc

Leitoscoloplos phyllobranchus

Blake, James A. 2017
2017
Loc

Haploscoloplos minutus:

Hartman 1978: 156
1978
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