Jassagruneri Conlan, 1990

Conlan, Kathleen E., Desiderato, Andrea & Beermann, Jan, 2021, Jassa (Crustacea: Amphipoda): a new morphological and molecular assessment of the genus, Zootaxa 4939 (1), pp. 1-191 : 156-158

publication ID

https://doi.org/ 10.11646/zootaxa.4939.1.1

publication LSID

lsid:zoobank.org:pub:F33F42D0-A139-4CE3-97D7-1314C12CF86B

DOI

https://doi.org/10.5281/zenodo.4580608

persistent identifier

https://treatment.plazi.org/id/03B487DA-FF2E-D985-C9C8-1B86FBEFFE29

treatment provided by

Plazi

scientific name

Jassagruneri Conlan, 1990
status

 

Jassagruneri Conlan, 1990 View in CoL

( Table 13 View TABLE 13 , Figs 102–103 View FIGURE 102 View FIGURE 103 )

Diagnosis.

Both sexes:

Mandibular palp: article 2, dorsal margin without a fringe of setae.

Maxilla 1: without a cluster of setae at the base of the palp article 1.

Gnathopod 1: basis, anterolateral margin with only a few short setae distally; carpus without a single or small cluster of short setae at the anterodistal junction of the propodus.

Gnathopod 2: basis with a few or a full row of setae along the anterolateral margin (setal lengths 50% of the basis width); carpus and propodus, setae on the anterior margin short and simple (setal length <basis width).

Pereopods 5–7: propodus not expanded anteriorly.

Uropod 1: ventral peduncular spinous process underlying about 40% of the longest ramus.

Uropod 3: inner ramus without spines mid-dorsally (with only the single apical spine).

Telson: tip without apical setae (only the usual short setae at each dorsolateral cusp).

Thumbed male: unknown.

Adult female:

Antenna 2: without plumose setae on the flagellum and peduncular article 5.

Gnathopod 2: propodus, palmsinuous.

Remarks. This is a small-bodied species with the juvenile male holotype 2.1 mm and the adult female allotype 3.2 mm ( Conlan 1990). It is part of the Southern Hemisphere sinuous-palmed group, keying closest to J. thurstoni . Jassa gruneri differs in the lack of a seta on the carpus of gnathopod 1 at the anterodistal junction of the propodus (present in J. thurstoni ) and in the presence of a row of setae on the basis of gnathopod 2 (absent in J. thurstoni ). This row is more pronounced in the female allotype than the juvenile male holotype ( Fig. 102 View FIGURE 102 ). Currently it is only known from Tasmania and New Zealand. The New Zealand specimen ( Fig. 12 View FIGURE 12 ) is a juvenile male and was found in a collection in Lyttelton harbour described by Chilton (1884). In this same collection is a specimen used by Chilton to describe his new species Podocerus latipes Chilton, 1884 , which was synonymized by Stebbing (1906) under Jassa frequens ( Chilton, 1883) and later transfered to Ventojassa ( Conlan 2021) .

Kingdom

Animalia

Phylum

Arthropoda

Class

Malacostraca

Order

Amphipoda

Family

Ischyroceridae

Genus

Jassa

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