Stenoninereis lackeyi (Hartman, 1958), reinst.
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publication ID |
https://dx.doi.org/10.3897/subtbiol.30.36273 |
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publication LSID |
lsid:zoobank.org:pub:13250A20-2FCC-48DE-828B-AE6CA926E94F |
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persistent identifier |
https://treatment.plazi.org/id/F573E5AB-1998-507C-A867-DC9FC145007C |
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treatment provided by |
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scientific name |
Stenoninereis lackeyi (Hartman, 1958), reinst. |
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comb. n. |
Stenoninereis lackeyi (Hartman, 1958), reinst. comb. n. Figures 1A View Figure 1 , 4 View Figure 4 , 5 View Figure 5
Nicon lackeyi Hartman 1958: 263-265, figs 1-5.
Stenoninereis martini Pettibone 1971: 39-41, figs 24 a–c (partim, non Wesenberg-Lund, 1958)
Material examined.
Paratypes. GULF OF MEXICO, UNITED STATES • 8, paratypes of Nicon lackeyi ; Florida, Sarasota County, Warm Mineral Springs; 27°02'43"N, 82°17'35"W; J. Lackey leg.; no date, 86 °F, 17000 ppm dissolved solids, 7.2 ± 0.2 pH; LACM-AHF 806.
Additional material.
GULF OF MEXICO, UNITED STATES • 60; Florida, Tampa Bay; 1963; J. L. Taylor leg.; USNM 45699 • 16; Halstead Bayou, Jackson County, Mississippi; Sep. 1975; R. Herd leg.; USNM 53273.
NORTHWESTERN ATLANTIC OCEAN, UNITED STATES • 6; North Carolina, Beaufort, Town Marsh; L. Cammen leg.; USNM 55619 • 7; North Carolina, Bogue Sound, Tar Landing Bay; Oct. 1976; R. T. Kneib leg.; USNM 55618.
Description.
Paratypes ( LACM-AHF 806) complete, some parapodia previously dissected; one complete paratype selected for description, 4 mm long, 0.5 mm wide at chaetiger 10, 31 chaetigers ( Fig. 4A View Figure 4 ). Specimens from Florida ( USNM 45699) most complete, some filled with large oocytes, two per segment ( Fig. 5A View Figure 5 ); one paratype used for variation, complete, 4.8 mm long, 0.4 mm wide, 33 chaetigers ( Fig. 5A View Figure 5 ). All specimens pale.
Prostomium wider than long, anterior margin shallowly cleft ( Fig. 4B View Figure 4 ); antennae subulate, half as long as prostomium; eyes black, anterior eyes reniform, slightly larger than posterior rounded ones, anterior and posterior eyes slightly overlapped ( Fig. 4B View Figure 4 ). Achaetous ring as long as first chaetiger; four pairs of anterior cirri, anterodorsal pair lanceolate, remaining ones subulate, longest one reaching chaetiger 7, ( Figs 4 A–B View Figure 4 ).
Pharynx previously removed in paratype. In non-type material, jaws light brown, 10 teeth restricted to half cutting edge ( Fig. 5B View Figure 5 ). Pharynx bare.
All chaetigers with noto- and neuroaciculae; dorsal cirri cirrophores and notopodial dorsal ligules of anterior chaetigers ciliate. In first two chaetigers ( Fig. 5C View Figure 5 ), notopodium consists in a small, rounded lobe bearing notoaciculum. Neuroacicular ligule subconical, 2.5 times longer than ventral cirrus. Ventral cirrus subulate, cirrophore and cirrostyle indistinct.
In anterior chaetigers ( Figs 4H View Figure 4 , 5 D–E View Figure 5 ), dorsal cirrus shorter than chaetiger width, excluding parapodia; cirrophore 1.5-2.0 times longer than cirrostyle, 1.3 times longer than notopodial dorsal ligule, 1.0-1.2 times longer than notopodial ventral ligule. Notopodial dorsal ligule digitiform, basally attached to, and half as long as, notopodial ventral ligule; notopodial ventral ligule subconical, 3.0-3.5 times longer than wide, 1.0-1.2 times longer than neuroacicular ligule. Neuroacicular ligule subconical, 2.3-2.5 times longer than wide, 2.8-3.0 times longer than ventral cirrus. Ventral cirrus subulate, cirrophore and cirrostyle indistinct.
In middle chaetigers ( Figs 4I View Figure 4 , 5F View Figure 5 ), dorsal cirrus shorter than chaetiger width, excluding parapodia; cirrophore 1.2-1.4 times longer than cirrostyle, 4 times longer than notopodial dorsal ligule, 1.0-1.2 times longer than notopodial ventral ligule. Notopodial dorsal ligule digitiform, basally attached to, and 0.2 times as long as, notopodial ventral ligule; notopodial ventral ligule subconical, 2.2-2.4 times longer than wide, as long as notopodial ventral ligule. Neuroacicular ligule subconical, 2.5-2.7 times longer than ventral cirrus. Ventral cirrus subulate, cirrophore and cirrostyle indistinct.
In posterior chaetigers ( Figs 4J View Figure 4 , 5G View Figure 5 ), dorsal cirrus shorter than wide of chaetigers excluding parapodia; cirrophore 0.6 times as long as cirrostyle, 0.7 times as long as notopodial ventral ligule. Notopodial dorsal ligule absent; notopodial ventral ligule subconical, 1.5-2.0 times longer than wide, 0.7-1.0 times as long as neuroacicular ligule. Neuroacicular ligule subconical, 2.0-2.1 times longer than wide, 2.5 times longer than ventral cirrus. Ventral cirrus subulate, cirrophore and cirrostyle indistinct.
Notochaetae sesquigomph spinigers. Neurochaetae sesquigomph spinigers in supra-acicular fascicles, heterogomph spinigers and falcigers in sub-acicular fascicles.
Notopodial ( Fig. 4D View Figure 4 ) and neuropodial ( Fig. 5E View Figure 5 ) supra-acicular sesquigomph spinigers pectinate, very minute teeth, progressively disappearing distally. Neuropodial heterogomph spinigers ( Fig. 4F View Figure 4 ) serrate, coarse teeth, longer teeth are longer than the wide of the blade, half of 1/3 of the blade edentate and subulate. Neuropodial heterogomph falcigers ( Fig. 4G View Figure 4 ) with very long blades, blades increasing their length toward posterior chaetigers, blades with minute teeth throughout, often inconspicuous; blades increasing their length from upper to lower positions in the same fascicle ( Fig. 4G View Figure 4 ).
Pygidium with two plate-like lobes; anal cirri subulate, as long as last four chaetigers ( Figs 4C View Figure 4 , 5A View Figure 5 ).
Remarks.
Hartman (1958) described Nicon lackeyi with several specimens but the exact number of them was not stated; the specimens were supposedly deposited in a single lot ( USNM 29627). Pettibone (1971) examined the lot and found the holotype and an additional lot with catalog number USNM 29628 containing two paratypes, but no further comments about the supposed splitting of the type material were added. These lots were not found during three research visits at the USNM (2015, 2016, and 2018). Some specimens, however, are deposited in the Los Angeles Museum; they were examined by Hartman, with identical field data as those recorded for the supposed type specimens. LACM material was labeled as paratypes by Kristian Fauchald according to the collection records, but no further comments were found. Because the specimens belonged to the original set of specimens, and because the specimens previously regarded as holotype and remaining type specimens are currently missing, the species was redescribed with available specimens in the LACM.
After a comparison between type material of N. lackeyi and S. martini led Pettibone (1971) to regard them as synonyms. However, there are relevant differences to separate them as two distinct species of the same genus. The main distinctive feature is the slender aspect of both notopodial ventral ligules and neuroacicular ligules and mainly observed in middle and posterior chaetigers, as seen when comparing the length/wide ratios in these ligules along the body. In anterior chaetigers, both species have similar ratios in notopodial ventral ligules, but Stenoninereis lackeyi comb. n. has larger ratios in the middle (2.2-2.4) and posterior (1.5-2.0) chaetigers than Stenoninereis martini (1.8-2.0 and 1.3-1.4, respectively). Likewise, in neuroacicular ligules, S. lackeyi comb. n. has larger ratios in anterior (2.3-2.5), middle (2.5-2.7), and posterior (2.0-2.1) chaetigers than S. martini (1.8-2.0, 1.4-1.8, and 1.4-1.5, respectively). Further, in anterior chaetigers, dorsal cirrophores in S. lackeyi comb. n. are 1.5-2.0 times longer than their respective cirrostyles, whereas in S. martini they are 2-3 times longer; in middle and posterior chaetigers, both species have similar ratios.
Stenoninereis lackeyi comb. n. is easily recognized from S. tecolutlensis , the other Gulf of Mexico species. In S. lackeyi comb. n., the prostomium is shallowly incised and the eyes are minute, whereas in S. tecolutlensis the prostomium is deeply incised and the eyes occupy a larger prostomial surface ( Fig. 1H View Figure 1 ). In addition, in S. lackeyi comb. n. the neuroacicular lobes are blunt, whereas in S. tecolutlensis they are acuminate.
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