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Keys to Aid in the Identification of Marine Harpacticoid Copepods. Amendment Bulletin No. 3.

Family Diosaccidae

Family Diosaccidae


Becker & Schriever (1979) describe a diosaccid copepodid of uncertain affinities for which they propose the new generic name Paraschizopera but to which they decline to give a trivial name in the belief that the interpretation of juvenile characters is problematic. Thus at present the genus Paraschizopera is not valid. However, their excellent description leaves no doubt that the specimen is a Stage V female and since only minor modifications are likely to occur at the final moult it is reasonable to regard the peculiar characters of this juvenile as representing also the most likely state of the adult. Article 17(4) of the International Code of Zoological Nomenclature permits the description of a species to be based on a juvenile. I have no doubt that this copepodid is a new species for which a valid genus must be erected. In the hope that it will cause the least confusion in the literature I shall use Becker & Schriever's presently invalid name for this new genus although it cannot, under these circumstances, come under their authorship. I propose formally, therefore, that Becker & Schriever's specimen be the Holotype of a new species, Paraschizopera beckeri n.sp., which itself is the type-species by monotypy of a new genus, Paraschizopera n.gen., of which the invalid name Paraschizopera Becker & Schriever, 1979 is a synonym. The description and distinctive features of this new species and genus are as described by Becker & Schriever (1979:58).

Paraschizopera beckeri n.gen., n.sp. requires a new codon in KGG 1 (p.70) —

page 5
2. Onychostenhelia falcifera Itô, 1979b keys out to the amended codon (Wells, 1979:3) for Pseudostenhelia in KGG 1 (p.70). Amend this so that the codon refers to KGG 1200 and add this new KGG to the family—

KGG 1200 — characters

1.♀ antennule
n - number of segments.
2.P.2-P.3 Exp. 3
n:n - number of setae and/or spines on P.2 and P.3 respectively.
3.♀ P.5 Benp.
n - number of setae and/or spines.
4.♂ P.4 Exp.
♀ - as female, mod - modified.
5.♂ P.5
d - Benp. and Exp. distinct, f - Benp. and Exp. fused.

KGG 1200

♀ A.1
Exp. 3 setae
♀ P.5
Benp. setae
♂ P.4
♂ P.5
5 6:6 2 f Pseudostenhelia prima
5 6:6 4 f P. wellsi
? 5:6 ? ♀ ? f P. secunda
7 7:8 5 mod d Onychostenhelia falcifera
3.KGG 1:
(a) Pseudodiosaccus propinquus has been omitted from the keys; add a new codon—
2/3/2/4/?:?:3 (p.70).
(b)AddDiosaccus hamiltoni to footnote c) on p.71.
4.KGG 100 (p.73):
(a) Stenhelia (S.) aemula; amend the codon to read—
(b)New codons are required for these new species by Thistle & Coull (1979) —
4/7:8:8/1:1:1/1:1:1/1 — Stenhelia (S.) diegensis.
4/6:7:8/0:0:0/2:1:1/1 — S. (S.) asetosa.
5.KGG 110 (p.74): Amphiascoides sp. ♂ Becker & Schriever, 1979 requires a new codon—
>Exp/se/7/?/2:5.page 6
6.KGG 200 (p.76): Through an error in Lang's table of setal formulae (Lang, 1948, p.593), where P.2 Exp. 1 of the pacificus-group of Amphiascus is stated as being asetose, the codons for A. pacificus, A. parvus and A. sinuatus are incorrect. In each case amend column three to read 1:1:1. As a further consequence A. undosus (p.77) should now be included in the codon for A. pacificus and A. parvus.
7.KGG 230 (p.80): Amphiascus profundus Becker & Schriever, 1979 to codon for Amphiascus b); add to footnote b).
8.KGG 400 (p.86): Stenhelia (D.) lima Becker & Schriever, 1979 requires a new codon—
9.KGG 500 (p.88):
(a) Pseudomesochra beckeri Becker & Schriever, 1979 requires a new codon—
(b) Stenhelia (D.) longifurca is redescribed by Reddy & Radha-krishna (1980a), who also describe the previously unknown male. Add to General Note 3 (p.99). They discover some errors in the original description and as a consequence the codon for this species should read—
i.e. the same codon as S. madrasensis and S. krishnensis (see also Wells, 1979:3).
10.KGG 600 (p.89): Delete Diosaccus hamiltoni.
11.KGG 700 (p.91): Pseudomesochra abyssalis Becker & Schriever, 1979 to codon for P. aberrans.