Drymaeus cecileae is a species

Species

In biology, a species is one of the basic units of biological classification and a taxonomic rank. A species is often defined as a group of organisms capable of interbreeding and producing fertile offspring. While in many cases this definition is adequate, more precise or differing measures are...

 of tropical air-breathing land snail

Land snail

A land snail is any of the many species of snail that live on land, as opposed to those that live in salt water and fresh water. Land snails are terrestrial gastropod mollusks that have shells, It is not always an easy matter to say which species are terrestrial, because some are more or less...

, a pulmonate gastropod mollusk in the family Orthalicidae

Orthalicidae

Orthalicidae are a family of tropical air-breathing land snails, terrestrial pulmonate gastropod mollusks are classified in the informal group Sigmurethra of the clade Stylommatophora...

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Distribution

Distribution of Drymaeus cecileae includes Peru: Loreto Region

Loreto Region

Loreto is Peru's northernmost region. Covering almost one-third of Peru's territory, Loreto is by far the nation's largest region and also one of the most sparsely populated ones, due to its remote location in the Amazon Rainforest...

, Tarapoto

Tarapoto

Tarapoto, known as the "City of Palms", is a thriving commercial hub in northern Peru, an hour by plane from Lima, situated in the San Martín Province of the San Martín Region, located in the high jungle plateau to the east of what is known as the selva baja...

 (type locality), and Juan Guerra

Juan Guerra District

Juan Guerra District is one of fourteen districts of the province San Martín in Peru.-References:...

, on the Huallaga River

Huallaga River

The Huallaga River is a tributary of the Marañón River, part of the Amazon Basin. Old names for this river include Guallaga and Rio de los Motilones. The Huallaga is born on the slopes of the Andes in central Peru and joins the Marañón before the latter reaches the Ucayali River to form the Amazon....

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Description

The living animal is brownish-beige throughout, including the tentacles.

The shell

Gastropod shell

The gastropod shell is a shell which is part of the body of a gastropod or snail, one kind of mollusc. The gastropod shell is an external skeleton or exoskeleton, which serves not only for muscle attachment, but also for protection from predators and from mechanical damage...

 is umbilicated, ovate-pyramidal, thin, translucid and shining. The color is pale buff, with elegant longitudinal narrow tawny streaks. The shell has 6 whorls

Whorl (mollusc)

A whorl is a single, complete 360° revolution or turn in the spiral growth of a mollusc shell. A spiral configuration of the shell is found in of numerous gastropods, but it is also found in shelled cephalopods including Nautilus, Spirula and the large extinct subclass of cephalopods known as the...

, that are a little convex. The last whorl is about as long as the spire. The suture is impressed. The spire

Spire (mollusc)

A spire is a descriptive term for part of the coiled shell of mollusks. The word is a convenient aid in describing shells, but it does not refer to a very precise part of shell anatomy: the spire consists of all of the whorls except for the body whorl...

 is conic and acute. Aperture

Aperture (mollusc)

The aperture is an opening in certain kinds of mollusc shells: it is the main opening of the shell, where part of the body of the animal emerges for locomotion, feeding, etc....

 is little oblique, oblong, with a very pale lilac border within. Columella is slightly arcuate. Peristome is thin, expanded, buff or white, not continuous.

The width of the shell is 7-10 mm. The height of the shell is 17-22 mm.

Specimen by Breure (2010) corresponds to the description given by Pilsbry

Henry Augustus Pilsbry

Henry Augustus Pilsbry was an American biologist, malacologist and carcinologist, among other areas of study. He was a dominant presence in many fields of invertebrate taxonomy for the better part of a century...

 (1898). He regarded this taxon as a colour form of Drymaeus strigatus

Drymaeus strigatus

Drymaeus strigatus is a species of tropical air-breathing land snail, a pulmonate gastropod mollusk in the family Orthalicidae.- Distribution :* Peru* Ecuador- Description :...

, which, however, has always a lilac band on the inside, bordering the peristome.

While Drymaeus species are known for their intraspecific variation in colour pattern, we here consider Drymaeus cecileae as a distinct taxon characterized by the more or less orange line behind the peristome, visible both on the inside and outside of the shell, and by being more slender than Drymaeus strigatus

Drymaeus strigatus

Drymaeus strigatus is a species of tropical air-breathing land snail, a pulmonate gastropod mollusk in the family Orthalicidae.- Distribution :* Peru* Ecuador- Description :...

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