Graphonema Cobb 1898

• Main Authors: Shimada, Daisuke, Tsujimoto, Megumu, Watanabe, Kentaro
• Format: Text
• Language: unknown
• Published: Zenodo 2019
• Subjects: Biodiversity; Taxonomy; Animalia; Nematoda; Adenophorea; Desmodorida; Chromadoridae; Graphonema; Antarc*; Antarctica
• Online Access: https://dx.doi.org/10.5281/zenodo.4585062; https://zenodo.org/record/4585062

Key to species of Graphonema 1 Gubernaculum (whole length) much longer than a half of spicule length···················································································· 2 – Gubernaculum either almost equal to or shorter than a half of spicule length ············································································ 3 2 Body shorter than 2.0 mm, spicules approximately 1.5 abd long······································································ G . mediterraneum – Body longer than 2.5 mm, spicule length equal to abd··································································································· G . arcticum 3 Spicules shorter than 30 µm ······································································································································· G . parafricanum – Spicules equal to or longer than 40 µm ··············································································································································· 4 4 Tail 7–9 abd long in both sexes ································································································································· G . northumbriae – Male tail either equal to or shorter than 6 abd··································································································································· 5 5 Gubernaculum thin, weakly developed ·············································································································································· 6 – Gubernaculum and lateral pieces well-developed····························································································································· 7 6 Spicule length almost equal to abd ······································································································································· G . georgei – Spicules twice as long as abd·················································································································································· G . vulgare 7 Proximal end of spicules with a set-off capitulum········································································································· G . amokurae – Proximal end of spicules with a not set-off capitulum························································································································ 8 8 Gubernaculum without tiny projections at distal end····································································································· G . scampae – Gubernaculum with tiny projections at distal end···························································································································· 9 9 Body shorter than 1.5 mm, lateral differentiation absent ························································································· G . metuliferum – Body equal to or longer than 2.0 mm, lateral differentiation present······················································· G . antarcticum sp. nov. : Published as part of Shimada, Daisuke, Tsujimoto, Megumu & Watanabe, Kentaro, 2019, A New Free-living Marine Nematode Species of the Genus Graphonema (Nematoda: Chromadorida: Chromadoridae) from Antarctica, pp. 61-67 in Species Diversity 24 (1) on page 66, DOI: 10.12782/specdiv.24.61, http://zenodo.org/record/4585216