Agladrillia Woodring, 1928

Fallon, Phillip J., 2016, Taxonomic review of tropical western Atlantic shallow water Drilliidae (Mollusca: Gastropoda: Conoidea) including descriptions of 100 new species, Zootaxa 4090 (1), pp. 1-363 : 17

publication ID

https://doi.org/ 10.11646/zootaxa.4090.1.1

publication LSID

lsid:zoobank.org:pub:203BAC25-B542-48FE-B5AD-EBA8C0285833

DOI

https://doi.org/10.5281/zenodo.6076237

persistent identifier

https://treatment.plazi.org/id/039F87C4-FA75-FFB8-CBAF-BD0AFAB3F807

treatment provided by

Plazi

scientific name

Agladrillia Woodring, 1928
status

 

Genus Agladrillia Woodring, 1928 View in CoL

Type species by original designation, Agladrillia callothyra Woodring, 1928 , Miocene [now considered Pliocene (from Donovan, 1998)], Bowden, Jamaica.

Diagnosis. According to Woodring (1928: 157), shell small, moderately slender; whorls moderately convex with a varix about ½-turn (“some distance”) from lip edge. Protoconch of 2 smooth whorls. Axial sculpture of narrow ribs that stretch from suture-to-suture, arcuate and reduced as “obscure prologations” in the sulcus, and spiral grooves and threads that may be reduced or obsolete on the axial ribs. Aperture long and narrow; outer lip with a relatively deep stromboid notch anteriorly and a deep U-shaped anal sinus posteriorly, near suture. Anterior canal moderately long, strongly constricted, deep, twisted to the right viewed ventrally and bent slightly dorsally, with an asymmetrical, deep notch at its tip. Inner lip detached; parietal wall with a heavy callus.

Key characteristics. The combination of the following characteristics separate Agladrillia View in CoL from all other TWA Drilliidae View in CoL :

1. Shell sculpture of widely spaced narrow ribs that run from suture-to-suture, lower and recurved in sulcus, and of deep spiral grooves that are diminished or obsolete on rib crests;

2. Varix hump-like, positioned ½-turn from edge of outer lip;

3. Ribs obsolete on dorsum of last whorl, except in sulcus;

4. Anterior canal strongly constricted and deeply notched at its end; and

5. Protoconch of approximately 1½–1¾ mostly smooth whorls.

Similar genera. Two other TWA genera also have deep spiral grooves. Calliclava McLean, 1971 differs in possessing a carinate, not smooth protoconch. Clathrodrillia Dall, 1918 has a smooth protoconch but differs in having a tapered rather than a “pinched” anterior canal, and a varix about ⅓-turn from the edge of the outer lip, not ½-turn as in Agladrillia .

Distribution. Agladrillia has been reported from northern South America ( Colombia to French Guiana).

Kingdom

Animalia

Phylum

Mollusca

Class

Gastropoda

Order

Neogastropoda

SuperFamily

Conoidea

Family

Drilliidae

Kingdom

Animalia

Phylum

Mollusca

Class

Gastropoda

Order

Neogastropoda

SuperFamily

Conoidea

Family

Drilliidae

Genus

Agladrillia

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