Circoniscus gaigei, PEARSE, 1917

Schmidt, Christian, 2007, Revision of the Neotropical Scleropactidae (Crustacea: Oniscidea), Zoological Journal of the Linnean Society 151, pp. 1-339 : 67-68

publication ID

https://doi.org/ 10.1111/j.1096-3642.2007.00286.x

persistent identifier

https://treatment.plazi.org/id/03858799-427E-FFA9-9B83-7C61A891FDD1

treatment provided by

Felipe

scientific name

Circoniscus gaigei
status

 

CIRCONISCUS GAIGEI PEARSE, 1917 View in CoL

Circoniscus gaigei Pearse, 1917 View in CoL – Van Name (1925, 1936); Arcangeli (1927 *); Paulian de Félice (1944); Lemos de Castro (1967); Boyko (1997 *).

? Paracubaris spinosus Collinge, 1917 View in CoL – syn. Van Name (1925).

Synarmadillo spinosus – Arcangeli (1927 *).

Circoniscus spinosus View in CoL – Van Name (1925); Leistikow & Wägele (1999 *); Schmalfuss (2003 *).

Not: Circoniscus gaigei View in CoL – Andersson (1960); Lemos de Castro (1967); Schmalfuss (1980); Souza & Lemos de Castro (1991); Schultz (1995 *); Warburg et al. (1997); Souza-Kury (1998 *); Leistikow & Wägele (1999 *).

Material examined

Types: Three ♀ m, three ♀ or immatures, fragments of one ♂ and six other specimens (syntypes of Ci. gaigei , British Guiana, Dunoon, leg. F. M. Gaige, 17 July 1914, Walker Expedition , University of Michigan, USNM 98371 View Materials ) .

Description ( Figs 204–208 View Figure 204 View Figure 205 View Figure 206 View Figure 207 View Figure 208 )

Male 7.3 mm wide, adult females (with marsupium) 6.2–7.5 mm wide. Pigment incompletely preserved, some specimens have patches of dark pigment near the posterior margins of the tergites. Cephalothorax short, with a weak but distinct transverse furrow behind the frontal shield. Coxal plate 1 with schisma as typical for the genus, the following coxal plates simple.

Eyes composed of 26–27 ommatidia.

Pereiopods covered with scales, these distally somewhat projecting from surface. Male pereiopods with ventral brushes as follows: carpus 1 with large ventrofrontal scale-field confluent with antennacleaning brush; carpus 2–5 with ventral scale-field of decreasing extent and density; carpus 1–7 with ventral scale-fields of slightly decreasing density; ischium 1 with ventrocaudal scale-field. Male pereiopod 7 ischium and merus without any scaly lobes and base without distinct water-conducting scale-row. Dactyli with large outer claw, small inner claw, ungual seta and small seta beside it, dactylar seta with hirsute apical portion, some aesthetasc-like setae beside base of dactylar seta, one frontal and one caudal subapical simple seta and some scales.

Pleopod 1–5 exopodites with distinct, weakly wrinkled respiratory fields and small marginal setae. Male exopodite 1 with triangular distal lobe, exopodites 2–4 with medial margin hairy, and exopodite 5 apically acute, with a median furrow (to which is still attached part of endopodite 2 in the specimen from which the drawing was made). In the only male specimen of the type series, the apex of both pleopod 1 endopodites is damaged, so this character remains unknown. Male pleopod 2 endopodite longer than exopodite. Uropod sympodites angulate; the distal margin is about three times as wide as the endopodite.

Geographical distribution (Map Fig. 203 View Figure 203 )

Guyana.

Remark

The type series contains only one male specimen. The characteristics of male pereiopod 7, as found in Circoniscus gaigei auct., are not present: the absence of these characters cannot be attributed to the possibility that the specimen is immature. In contrast, both males and females are distinctly larger than in C. gaigei auct. This implies that the type specimens of C. gaigei belong to a different species than the specimens determined as C. gaigei by subsequent authors. For the latter, the name C. ornatus ( Verhoeff, 1941) is valid (see below).

The description of Paracubaris spinosus Collinge, 1917 does not contain any useful information. The type specimens were not available for study. According to the size of the specimens (20.5 mm), it is a synonym of C. gaigei , as proposed by Arcangeli (1927), rather than a synonym of C. ornatus .

Kingdom

Animalia

Phylum

Arthropoda

Class

Malacostraca

Order

Isopoda

Family

Scleropactidae

Genus

Circoniscus

Loc

Circoniscus gaigei

Schmidt, Christian 2007
2007
Loc

Circoniscus gaigei

Pearse 1917
1917
Loc

Paracubaris spinosus

Collinge 1917
1917
Loc

Circoniscus gaigei

Pearse 1917
1917
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