Laubieriellus Maciolek, 1981b

Peixoto, Antônio João Malafaia & Paiva, Paulo Cesar De, 2019, New Prionospio and Laubieriellus (Annelida: Spionidae) species from Southeastern Brazil, Zootaxa 4577 (3), pp. 529-547: 539-540

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Laubieriellus Maciolek, 1981b


Genus Laubieriellus Maciolek, 1981b 

Type-species: Laubieriellus grasslei Maciolek, 1981b 

Diagnosis (emended from Erickson & Wilson, 2018): Prostomium anteriorly rounded, or with slight medial incision, extended posteriorly as a caruncle, occipital tentacle absent. Peristomium distinct from chaetiger 1, partly fused to prostomium. Four pairs of branchiae from chaetiger 2; branchiae elongate, cylindrical, smooth and distinct from notopodial lamellae. Neuropodial lamellae connected by ventral crests from chaetiger 2, rarely 1. Postbranchial notopodial lamellae connected in dorsal crests. Anterior chaetae all capillaries, multidentate hooded hooks present in posterior neuropodia. Notopodial hooks absent. Pygidium with two short ventrolateral lobes or cirri and one dorsomedial cirrus, or three subequal lobes or an undifferentiated ring.

Remarks: Maciolek (1981b) described Laubieriellus  based on deep-sea specimens found on the Galápagos Rift and also placed Prionospio salzi Laubier, 1970  in Laubieriellus  . Laubier (1970) considered his specimens as late-stage larvae, despite an adult morphology, as noted by Maciolek (1981b). The reexamination of the holotype (USNM 42621) also revealed the presence of oocytes from chaetiger 9–10.

Blake et al. (2017) considered Laubieriellus  as part of the Prionospio  -complex, as although morphologically similar to Prionospio  , Laubieriellus  species lack notopodial hooks and present ventral crests on several anterior chaetigers. The ventral crest, however, is not exclusive to Laubieriellus  and has been observed in Prionospio rugosa Sigvaldadóttir, 1997  and Prionospio cristaventralis, Delgado-Blas et al. 2018  . The genus diagnosis was emended to include a ventral crest on chaetiger 1, as observed in Laubieriellus grasslei  ( Fig. 10View FIGURE 10).

The notch on the ventral crests, a character generally neglected, is present in Laubieriellus grasslei  ( Maciolek 1981b: Fig. 4AView FIGURE 4), L. cacatua Erickson & Wilson, 2018  , L. decapitata  sp. nov. ( Fig. 11BView FIGURE 11; 12CView FIGURE 12) and L. salzi  ( Laubier 1970; Dagli 2013: Fig. 3AView FIGURE 3), as indicated in Laubier’s (1970) description: “Enfin, en avant du neuropode une crête fine se prolonge ventralement presque jusqu'h la ligne médioventrale.” (Finally, in front of the neuropodium, a fine crest extends ventrally almost to the medioventral line). This notch can be shallow and incomplete, as seen in L. cacatua  and L. decapitata  sp. nov., or a complete notch, as in L. salzi  and L. grasslei  ( Fig 10View FIGURE 10 B–C).